Short wave therapy unit



April 23 1940- H. s. BAYLEss E-r AL 2,198,073

sHR'r wAvn THERAPY UNIT l Filed sept. 28,1936 2 sheets-sheet 1 April 23, 1940. H. s. BAYLEss er AL 2.198.073

SHORT' WAVE THERAPY UNIT Filed Sept. 28. 1936 2 Sheets-Sheet 2 Patented Apr. 23, 1940 UNITEDL STATES SHORT WAVE THERAPY UNIT Harold S. Bayless, Herman D. Bauer, and Hyman- D. Fischer, Chicago, Ill.

Application Septemberl 28, 1936, Serial No. 102,912

2 Claims.

The present invention relates to means for electro-therapy.

.Among the objects of the invention is to provlde a novel device for treating patients with high frequency or short wave electromagnetic energy or the like, such means being in the nature of an electro-therapy device comprising one or more thermionic valves provided with the usual heated filaments or cathodes, grids and anodes or plates connected to the input circuit and with the grids in circuit with a grid coil inductively coupled to a conversion coil connected to the plates or anodes, the conversion coil being in turn inductively coupled to pick up coils in the output circuit to the electrodes for the patient.

The resonance of the output circuit is controlled by one or more variable capacities or condensers designed to effect the desired frequency of the electromagnetic energy imparted to the patient.

Another object of the invention is to provide a novel inductance couple between the grid and plate circuits, with or without a novel couple between the conversion and pick-up coils for the output. g

A further object of the invention is to provide a novel frequency or resonance control or adjustment for the inductive couples or couplings above mentioned, for varying the output frequency along the resonance band or spectrum within the desired range, with or without a master variable capacity or condenser for selectively adjusting the range over such band or spectrum. the master capacity acting to adjust.

set or shift the range mentioned and controlled by the above tuning condenser to the desired locus of said band or spectrum whereby the tuning condenser may vary or tune within the adjusted range mentioned above.

Another object of the invention is to provide a novel device comprising an adjustable arrangement of the inductive couples wherein .the vaxis of the conversion couple may be angularly varied relative to the axis of the pick-up coils, as also (Cl. 12S-422) annular in cross section or tubular so as to provide inner and outer surfaces for the action of the electrical energy.

Other objects, capabilities, advantages, 'features, and the like are comprehended by the invention as will later appear and as are inherently possessed by the invention.

Referring to the drawings:

Fig. 1 is a wiring diagram and diagrammatic view of the means constructed in accordance 20 with the invention;

Fig. 2 is a plan view of the conversion coil and the pick-up coils, showing the mode of acusting or varying the inductive coupling therebetween;

Figs. 3 and 4 are similar views'of alternative u' broken section, of one of the electrode pads used 20A on the patient: and,

Figs. 7 and 8 are perspective views showing the application of divided or bifurcated velectrode pads upon different parts of the Lbody of the respectively having cathodes or filaments 3 and The 30 l, grids 5 and E and anodes 1 and 3. cathodes 3 and l are heated from a circuit 9 containing the secondary III of a transformer II,

the primary I2 of which is in the supply circiit L I3, which may carry the usual Vv volt A. C.

energy. The grids 5 and 6 are connected by way 35.,

of conductors Il and I5 to a grid coil I6, from the center tap I1 of which runs a conductor -I3 by way of a biasing high resistance I9 to a secondary 20 of a transformer 2|, the primary 22 of which is connected by way of conductors 23 -40 and 24 to the input line I3. The secondary 20 runs by way of a conductor 25 to a center tap 26l of an inductance or converting coil 21 the opposite ends 28 and 29 of which are connected to conductors 30 and 3I running to the anodes. or l415 plates 'I and 8. At the ends of the coil 21 are located", in suitably spaced relation, pick-up coils 32 and 33, whichmay be of pancake type, connected, at an end thereof to conductors 3l and 35 leading to a variable condenser 36 of suitable 60.

capacity for varyingl the resonance of the output circuit, the other ends of the coils 32 and 33 being connected by way of conductors 31 and 3l, condensers 39 and 40, conductors II and 42, to

electrode pads 43 and I4 to be used on the 56 of'. dr)

patient. In shunt with the coil 21 may be provided a master variable condenser 45 connected by way of conductors 45 and 41 to the ends o! the coil 27.

A filter system may be used to ground-any strays, static, or the like, and it may comprise conductors 48 and 49, choke coils 50 and 5l, condensers 52 and 53, conductors 54, 55 and 56, and ground 5l, the system being connected across the input line i3 ahead ci the transformers H and 2l The coil 2l (see Figs. 2, 3, and 4) is preferably tubular so as to present an inner surface 58 and an outer surface 59 for the action of the electrical energy, and is also preferably coiled in the form of a reer; or concave conoid, the interconvolutions being of lesser diameter than the other coni'olutions. This form oi coil has been found to be most efficient because the l tubular qenvclutions are disposed in that portion g greater flux density, said field being due to the magnetic lines oi force, these lines usually being curved.

it has also been discovered that the best results are obtained when the coil El' is so disposed with relation to the coils El? and as to have its axis at an acute angle to the axis Si of the pickup coils and 33, the angularity depending upon the physical characteristics of the coils, such as 'se linear length of the tubing used, the axial length of the coil 2i in general, the diameter of the tubing used in the coils 2l, 32 and 33, the thickness of the material between the inner and outer surfaces of the tubing, the size and relation or" the convolutions, the nature of the metal used, such as copper, brass, or the like etc. The proper angle may be readilif determined by a simple test in connection with a suitable indicating or ieasuring instrument. While we are not prepared to state the theory ci action, yet it appears that it is due to the loosening or tightening o the inductive coupling between the coil El and the pickup coils and and apparently the effect is the narrowing or sharpening of the tuning in the range o frequencies, the coil 2 is designed to produce. lvorwover, the eiiect also appears to be one of amplitude of the waves, that is, as the tuning is sharpened the amplitude increases. The coil in our invention, is so designed as to be set at the desired angle corresponding to the intensity oi the out-put desired.

Figs. 3 and show alternative forms of coil 2l and are so designed as torgive different output ects as desired or needed.

The pickup coils 32 and 33 are preferably of the fiat spiral or pancake type, although they may be of different forms as desired. They are also preferably tubular for the same reason stated above in connection with coil 2T. Also, the grid coil i8,

i is preferably tubular for the same reason.

The electrode pads 43 and 44 each comprises a metal plate 62 preferably of open work such as a screen or perforated sheet xed in a frame 3, and conductor branches G4 integrally or fixedly united to the plate 52, as by soldering, brazing, Welding, or the like, at suitable points or spots S5, these conductors being united or grouped into a cable ii, havingV a suitable insulating covering, the cable being held in place by a suitable securing element, such as a bracket or clip G1, suitably secured to the frame 53. The plate 62 with its frame 53 and the elements 64 and'65 are preferably embedded in a pad 58 of electrically nonconducting brous material, such as cotton, Wool,

i pulp nbres, ax fibres, silk, or the like.

The present invention is of what may be termed the short wave radio type and is preferably designed to operate in that portion of the band or spectrum of frequencies from about 30 meters wave length to a fraction of a meter wave length. It differs from the diathermic device in which the operation is on the spark gap principle, metal electrodes are used and which directly Contact the surface of the patient, and the wave lengths run from about 100 meters to 500 meters, no thermionic tube being used in spark gap oscillation or spectrum between about 30 meters to a fraction of a meter, thus covering what is known as the short and the ultra short waves. The effect on the patient, whether it be termed heat or otherwise, is a spreading or diffusing of the energy throughout the whole body of the patient, at a very low current intensity similar to beams of light emanating from the electrodes as sources. While we are not prepared to say what may be the exact effect, yet it appears to be an electronic effect on the tissues or the chemicals or both in the body of the patient. When the output energy is concentrated at the point or edge oi' a therapie needle or so called radio knife, the effect is a coagulation of the tissues.

Referring again to the diagram in Fig. l, it will be seen that there are two controlling variable condensers 3B and 5. For the purpose or" illustration, the coil El may be designed to induce frequencies in the output circuit of from about 30 meters in length to a fraction of a meter when the condenser 45 is regulated or adjusted. The condenser 45 is, therefore, so designed that when it is opened the coil operates at 30 meters, there being no ley-passing in the shunt circuit of the condenser 45. On the other hand, the condenser 3G which is in shunt with the pickup coils 32 and 33, maybe designed, as for example, to vary the resonance or tuning of the output circuit with a 712 meter range, that is, by way of example, from a frequency of 30 meters wave length to a frequency of 22 /g meters wave length when the condenser 45 is full open es given above. When the condenser is partly closed, say quarter way, then the coil operates at a frequency of 22"/2 meters wave length, and then the condenser 3S will vary the tuning or resonance over a range of 'l1/2, that is, between 221,5 meters wave length to l5 meters wave length. Furthermore, when the condenser 45 is set at half so that the coil operates at a frequency of l5 meters wave length, the condenser 35 then tunes from l5 meters wave length to "l1/2 meters wave length. When the condenser 45 is at three-quarters closed the coll. 21 operates at a frequency of '7l/, meters wave length and the condenser 35 then tunes from, 'l1/2 meters wave length to a small fraction of a meter. It will thus be seen that the condenser 3B tunes with a tine adjustment or regulation from whatever setting is made by the condenser 45. In this way the whole range of short and another by removal and replacement as has been necessary heretofore.

In some cases when it is desired to treat two f portions of the body, such as both sides of the chest or both feet at the same time. the electrodes may be bifurcated as shown in Figs. 'I and 8,' wherein (Fig. 7) the electrodes and b may be applied to the chest and corresponding electrodes l and b are respectively appliedl to the back, and (Fig. 8) the electrodes 43* and b may be applied to the feet and the electrodes Il and Il may be correspondingly applied to the calves of the legs, as shown.

While we have herein described. and-upon the drawings shown an illustrative embodiment of the invention, it is to be understood that the inventionY comprehends other structures, arrangements of parts, details, features or the like without departing from the spirit ofthe invention.

Having thus disclosed the invention,

We claim:

1. An electro-therapy device comprising thermionlc valves having cathodes, grids and anodes, an input circuit, a transformed circuit from said input circuit to said cathodes to heat said cathodes, a transformed circuit from said input circuit located as^to be varied in angular relation of the axes thereof, said conversion coil having its convolutions so varied in diameter as to be in generally conoidal form, electrode pads electrically connected to said pick-up coils, and a variable capacity connected in shunt with said pick-up coils for tuning the resonance of the circuit to said electrode pads.

2. An electro-therapy device comprising thermionic valves having cathodes. grids and anodes, an input circuit, a transformed circuit from said input circuit to said cathodes to heat said cathodes, a transformed circuit from said input circuit to saidvgrids and said anodes, a grid coil in the circuit of said grids, a conversion inductance coil in the circuit of said anodes, pick-up coils inductively coupled to said conversion coil, said coils being of tubular material to present inner and oiiter electrically active surfaces, said conversion and pick-up coils being so arranged and located as to be varied in angular relation of theaxes thereof, said conversion coil having its convolutions so varied in diameter as to be in generally conoidal form, electrode pads electrically connected to said pick-up coils, a variable capacity connected in shunt with said pick-up coils for tuning the resonance of the circuit to said electrode pads, and a variable capacity connected in shunt with said conversion coil for adjusting the frequency range for said circuit to said electrode pads.

HARdLD s. BAYLEss. HERMAN D. BAUER.` HYMAN` D. FISCHER. 

